Ch 12 - EDTA: Ethylenediaminetetraacetic Acid Chapter 12...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12 EDTA Titrations Dr. E. Binamira-Soriaga Department of Chemistry EDTA: Ethylenediaminetetraacetic Acid EDTA forms stable 1:1 complexes with most metal ions binding through its 4 oxygen and 2 nitrogen atoms M n + + EDTA MY n 4 1 mol metal ion:1 mol EDTA Metal-EDTA Complex EDTA forms stable 1:1 complexes with most metal ions binding through its 4 oxygen and 2 nitrogen atoms M n + + EDTA MY n 4 Stability of Metal-Chelate Complexes Chelate effect: Bidentate ligand forms more stable complex than two monodentate ligands Various Forms of EDTA Various Forms of EDTA H 6 Y 2 + H 5 Y + H 4 Y H 3 Y H 2 Y 2 HY 3 Y 4 EDTA (tetraprotic) fully protonated form hexaprotic All acidic hydrogens are dissociated upon metal complexation: Common reagent used is its disodium salt, Na 2 H 2 Y . 2H 2 O M n + + Y 4 MY n 4 K f = [MY n 4 ] [M n + ][Y 4 ]
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fractional Composition of EDTA Fractional Composition of EDTA Fraction of EDTA in the form Y 4- : Fraction of Deprotonated Form at Various pH EDTA Complexes The equilibrium constant for the formation of
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/15/2010 for the course CHEM 316 taught by Professor Soriaga during the Fall '08 term at Texas A&M.

Page1 / 4

Ch 12 - EDTA: Ethylenediaminetetraacetic Acid Chapter 12...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online